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US5282163A
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US
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Programmable logic device with circuit portions common to both configuration and use circuits
Assignee: Kawasaki Microelectronics Inc
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Filing: 1991-11-14
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Granted: 1994-01-25
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Expires: 2011-11-14
Abstract
Abstract In a programmable logic device having a memory circuit for storing circuit configuration data and a logic gate block for realizing a logic circuit desired by a user on the basis of the circuit configuration data written into the memory circuit, a switching circuit is provided for controlling at least a part of a circuit for writing the circuit configuration data into the memory circuit so as to be utilized as a part of the logic circuit desired by the user after the circuit configuration.
Inventors
- 👤 Keiji Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:38
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/173; H03K19/177; H03K19/17748; H03K19/1776; H03K19/17704; H03K19/17724; H03K19/17728
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
A programmable logic device, comprising: a look-up table type logic gate circuit for realizing a desired logic circuit based on circuit configuration data; and a memory circuit for storing the circuit configuration data, the stored circuit configuration data configuring the logic gate circuit, wherein a common circuit portion is utilized both as part of the memory circuit and as part of the logic gate circuit.
Claim 2
Dependent Claim
65 words
A programmable logic device, comprising: a look-up table type logic gate circuit for realizing a desired logic circuit based on circuit configuration data; and a memory circuit for storing the circuit configuration data, the stored circuit configuration data configuring the logic gate circuit, wherein a common circuit portion is utilized both as part of the memory circuit and as part of the logic gate circuit.
Claim 3
Dependent Claim
44 words
The programmable logic device of claim 1, wherein the common circuit portion comprises a switching circuit, the switching circuit determining when the common circuit portion is part of the memory circuit and when the common circuit portion is part of the logic gate circuit.
Claim 4
Dependent Claim
19 words
The programmable logic device of claim 1, wherein the common circuit portion comprises signal wiring for carrying data signals.
Claim 5
Dependent Claim
23 words
The programmable logic device of claim 3, wherein the signal wiring comprises at least one of bit line wiring and word line wiring.
Claim 6
Dependent Claim
16 words
The programmable logic device of claim 1, wherein the common circuit portion comprises an address decoder.
Claim 7
Dependent Claim
16 words
The programmable logic device of claim 1, wherein the common circuit portion comprises a driver circuit.
Claim 8
Dependent Claim
20 words
The programmable logic device of claim 6, wherein the driver circuit writes the circuit configuration data into the memory circuit.
Claim 9
Dependent Claim
16 words
The programmable logic device of claim 1, wherein the common circuit portion comprises a column selector.
Claim 10
Dependent Claim
25 words
The programmable logic device of claim 8, wherein the column selector selects a column of the memory circuit for writing the circuit configuration data therein.
Claim 11
Dependent Claim
17 words
The programmable logic device of claim 1, wherein the common circuit portion comprises an output buffer gate.
Claim 12
Dependent Claim
95 words
A programmable logic device, comprising: a look-up table type logic gate circuit for realizing a desired logic circuit based on circuit configuration data; and a memory circuit for storing the circuit configuration data, the stored configuration data configuring the logic gate circuit, wherein a common circuit portion, being common to both the logic gate circuit and the memory circuit, comprises a write driver circuit and a switching circuit, the switching circuit determining when the common circuit portion is part of the memory circuit and when the common portion is part of the logic gate circuit.
Claim 13
Dependent Claim
95 words
A programmable logic device, comprising: a look-up table type logic gate circuit for realizing a desired logic circuit based on circuit configuration data; and a memory circuit for storing the circuit configuration data, the stored configuration data configuring the logic gate circuit, wherein a common circuit portion, being common to both the logic gate circuit and the memory circuit, comprises a write driver circuit and a switching circuit, the switching circuit determining when the common circuit portion is part of the memory circuit and when the common portion is part of the logic gate circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |